reverso

@@ -13,3 +13,2 @@
-<gloss>plan which is shown on the left</gloss>
-<gloss>left-most plan</gloss>
-<gloss>map on the left (chart, graph)</gloss>
+<gloss>the left figure (diagram, illustration, chart, graph, etc.)</gloss>
+<gloss>figure on the left</gloss>

align w 右図

@@ -12,0 +12,1 @@
+<xref type="see" seq="2411930">右図</xref>

See below.

Google hits 200k. Usage in text is seen often. The meaning is given in both your links and elsewhere. The reading is given in both of your links.
Once one has got the reading and meaning confirmed, it is obvious, but the novice searches around and it does not seem to come up readily. Perhaps you will consider promotion.
If this headword can also have the reading as shown in the following "RH," then perhaps this should be shown in one entry:-
左図 【ひだりず】 (?) ???; RH
However, it will be disappointing to discover that the Japanese can say this headword in any way that takes their fancy and no one will be surprised.